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The first three quarters of 2023 has seen exceptional heat globally, putting 2023 on track to be the warmest year since records began in the mid-1800s, and likely for millennia before as well.

The past four months, in particular, have far exceeded any prior records, with September smashing the prior record by around 0.5C.

In this latest “state of the climate” quarterly update, Carbon Brief finds:

  • June, July, August, September and (very likely) October were the warmest respective months since records began.
  • 2023 is now virtually certain to be the hottest year on record globally.
  • A strong El Niño is expected to persist until mid-2024 in the majority of El Niño Southern Oscillation (ENSO) forecast models.
  • October is likely to be extremely warm based on daily data so far, though not quite as unusual as September.
  • While the exceptional warmth of the last few months is primarily driven by a strong El Niño on top of human-driven warming, other contributing factors include an uptick in the 11-year solar cycle, an unusual volcanic eruption last year and a 2020 phaseout of planet-cooling sulphur dioxide in marine shipping fuels.
  • Ocean heat content set a new record in September and has increased substantially over the past 12 months.
  • Antarctic sea ice has been exceptionally far below the prior record low for the past six months, while Arctic sea ice remains at the low end of the historical range.
  • Global temperatures are closely aligned with the projections from climate models.

Global temperatures have soared in recent months

After a cool start due to an unusually persistent “triple dip” La Niña event, global temperatures have soared in recent months driven by rapidly growing El Niño conditions.

This short-term natural variability builds on top of the roughly 1.3C warming that has occurred since the mid-1800s due to human emissions of CO2 and other greenhouse gases.

The figure below shows how global temperature so far in 2023 (black line) compares to each month in different years over the prior decade (coloured lines) in the Berkeley Earth surface temperature dataset.

Temperatures for each month from 2015 to 2023 from Berkeley Earth. Anomalies plotted with respect to a 1850-99 baseline. Chart by Carbon Brief.

Temperatures for each month from 2015 to 2023 from Berkeley Earth. Anomalies plotted with respect to a 1850-99 baseline. Chart by Carbon Brief.

Every month from June onward this year has set a clear record, with July, August and September shattering prior records by at least 0.3C (and around 0.5C in the case of September). The exceptional summer warmth means that it is now virtually certain that 2023 will be the warmest year on record.

In this latest quarterly state of the climate assessment, Carbon Brief analysed records from five different research groups that report global surface temperature records: NASA’s GISTEMP; NOAA’s GlobalTemp; Hadley/UEA’s HadCRUT5; Berkeley Earth; and Copernicus/ECMWF.

The figure below shows the annual temperatures from each of these groups since 1970, along with the average over the first nine months of 2023. (Note: at the time of writing, September data was not yet available for the Hadley/UEA record.)

Annual global mean surface temperatures from NASA GISTEMP, NOAA GlobalTemp, Hadley/UEA HadCRUT5, Berkeley Earth and Copernicus/ECMWF (lines), along with 2023 temperatures to date (January-September, coloured shapes). Each series is aligned by using a 1981-2010 baseline, with warming since pre-industrial based on HadCRUT5 values from the 1850-1899 to 1981-2010 periods. Chart by Carbon Brief.

Annual global mean surface temperatures from NASA GISTEMP, NOAA GlobalTemp, Hadley/UEA HadCRUT5, Berkeley Earth and Copernicus/ECMWF (lines), along with 2023 temperatures to date (January-September, coloured shapes). Each series is aligned by using a 1981-2010 baseline, with warming since pre-industrial based on HadCRUT5 values from the 1850-1899 to 1981-2010 periods. Chart by Carbon Brief.

The globe as a whole has warmed around 1C since 1970, with strong agreement between different global temperature records. All show that year-to-date 2023 records are higher than any prior annual record. However, there are larger differences between temperature records further back in time (particularly pre-1900) due to sparser observations and a resulting greater sensitivity to how gaps between measurements are filled in.

This year started out a bit on the colder side in all the different temperature records, with January only the seventh warmest January on record and February only the fourth or fifth warmest. March was the second warmest on record, April the fourth or fifth, and May the third warmest across all datasets.

However, from June onward each month has been unambiguously the warmest on record across all the different datasets. The respective rankings of each month in each dataset are shown below.

GISTEMP HadCRUT5 NOAA Berkeley Copernicus
Jan 7th 7th 7th 7th 7th
Feb 4th 4th 4th 5th 5th
Mar 2nd 2nd 2nd 2nd 2nd
April 4th 4th 5th 4th 5th
May 3rd 3rd 3rd 3rd 3rd
June 1st 1st 1st 1st 1st
July 1st 1st 1st 1st 1st
Aug 1st 1st 1st 1st 1st
Sept 1st TBC 1st 1st 1st

Rankings of 2023 global temperature by month across different datasets.

The continued strengthening of El Niño over the next few months means that it is likely that this streak of record-setting warmth will continue.

The figure below shows a range of different ENSO forecast models produced by different scientific groups. The values shown are sea surface temperature variations in the tropical Pacific – the El Niño 3.4 region – for three-month periods.

El Niño-Southern Oscillation (ENSO) forecast models for overlapping three-month periods in the Niño3.4 region (August, September, October – ASO – and so on) for the remainder of 2023 and then into the summer of 2024.
El Niño-Southern Oscillation (ENSO) forecast models for overlapping three-month periods in the Niño3.4 region (August, September, October – ASO – and so on) for the remainder of 2023 and then into the summer of 2024. Credit: Images provided by the International Research Institute for Climate and Society, Columbia University Climate School.

Virtually all models expect El Niño conditions to remain until early-to-mid 2024. Most models project a strong El Niño (>1.5C Niño 3.4 sea surface temperature – SST – anomaly), but relatively few expect a “super El Niño” (>2.5C) as strong as the world saw in 2015-16 or 1997-98.

Extreme heat worldwide

Record-setting global temperatures contributed to record heatwaves in many regions over the recent northern-hemisphere summer. The figure below shows the parts of the world that saw record warm or cold temperatures over the first two-thirds of 2023 (January through to September) in the Berkeley Earth dataset.

Large parts of the North Atlantic saw record warm temperatures, as did the UK, large parts of Europe, the southern US and Mexico, Central America, South America, the Caribbean, Korea, Japan and China.

Notably, no area on Earth saw record cold (or even the second-to-fifth coldest temperatures on record).

Map of year-to-date (January-September) regions that set new records (warmest through to fifth warmest).
Map of year-to-date (January-September) regions that set new records (warmest through to fifth warmest). Note that no regions set cold records for the year-to-date in 2023. Credit: Berkeley Earth

In September alone, 77 different countries – mostly in Europe and the tropics – set new monthly average records.

Virtually everywhere on the planet saw warmer-than-usual temperatures for the year so far, with the exception of the western US, India and Greenland.

The tropical Pacific shows a strong characteristic “warm tongue” associated with El Niño over the first nine months of the year. The global temperature anomalies (changes) relative to the 1951-80 period used by Berkeley Earth are shown in the map below.

Map of year-to-date (January-September) global surface temperatures.
Map of year-to-date (January-September) global surface temperatures. Anomalies are shown relative to the 1951-1980 period following the convention used by Berkeley Earth. Credit: Berkeley Earth.

October continuing the record warm streak

While global temperature records are not yet in for the full month of October 2023, real-time reanalysis products increasingly allow scientists to track global temperatures on a daily basis.

Reanalysis pulls together a huge amount of data from satellites, weather balloons, aeroplanes, weather stations, ships and buoys to provide a detailed look at how the Earth’s climate is changing in real-time.

Modern reanalysis products, such as JRA-55 and ERA5, use state-of-the-art methods to produce records that align well with traditional surface temperature datasets over recent decades.

In the figure below, Carbon Brief shows the daily global temperature anomaly values from the JRA-55 reanalysis product for each day since the record began in 1958 (grey lines). It shows the current year to date (2023) in red and the prior record warm year, 2016, in blue. Nearly every single day since mid-June 2023 has been warmer than any prior days since the JRA-55 record began in 1958 – and, potentially, much further into the past.

Daily global mean surface temperature anomalies from the JRA-55 reanalysis product, using its standard 1991-2020 baseline period.
Daily global mean surface temperature anomalies from the JRA-55 reanalysis product, using its standard 1991-2020 baseline period. Lines show global surface temperature anomalies for each day since the record began in 1958 (grey), the current year of 2023 to date (red) and the previous record warm year in 2016 (blue). Chart by Carbon Brief.

The heat map below focuses on 2023, showing each day in the year, with columns representing each month. The red shading shows the temperature anomaly of each day, with darker shading indicating more extreme temperatures. The map highlights how extreme the prior four months (from July onward) have been compared to the prior period.

Daily global average surface temperature anomalies for 2023 from the JRA-55 reanalysis product, using its standard 1991-2020 baseline period.
Daily global average surface temperature anomalies for 2023 from the JRA-55 reanalysis product, using its standard 1991-2020 baseline period. Chart by Carbon Brief.

With most of the data for the month of October now available in the JRA-55 reanalysis product, Carbon Brief estimates that October 2023 will be the warmest October on record, and is likely to exceed the prior record by at least 0.3C.

The figure below shows Carbon Brief’s estimate for October, with uncertainty intervals estimates based on the historical relationship between the first 19 days of the month available at the time of publication and the overall monthly average.

Monthly global mean surface temperature anomalies from the JRA-55 reanalysis product, using its standard 1991-2020 baseline period.
Monthly global mean surface temperature anomalies from the JRA-55 reanalysis product, using its standard 1991-2020 baseline period. Lines show global surface temperature anomalies for each year since the record began in 1958, with years coloured by decade. The current year (2023) is shown in black. Chart by Carbon Brief.

October is projected to not be quite as extreme as September’s record-shattering anomaly, but will still come in as the second highest anomaly of any month in 2023 to-date.

In addition to temperature anomalies, reanalysis products are able to provide an accurate near-real-time estimate of global absolute temperatures. The figure below shows the absolute temperature of each month of 2023 compared to all prior years in the record, with Carbon Brief’s October estimate and its uncertainties shown.

Monthly absolute global average surface temperatures from the JRA-55 reanalysis product.
Monthly absolute global average surface temperatures from the JRA-55 reanalysis product. Lines show global surface temperatures for each year since the record began in 1958, with years coloured by decade. The current year (2023) is shown in black. Chart by Carbon Brief.

Unpacking the drivers of recent record warmth

The extreme surface temperatures seen over the past few months have triggered a broader debate in the scientific community around its potential drivers.

For example, the world has never seen a month exceed the prior monthly record by 0.5C – as experienced in September. The closest analogue is February 2016, where global temperatures beat the prior record by 0.47C.

However, February 2016 was shortly after the peak of a super El Niño event – when the effect of El Niño on global temperatures is expected to be the largest. September 2023, by contrast, occurred early in the evolution of the current El Niño event when the contribution to global temperatures is typically much smaller.

This has led to a search for alternative explanations of factors contributing to recent record warmth. While the rapid switch from modest La Niña conditions at the start of the year to growing El Niño conditions on top of human-driven warming remains the primary explanation, it cannot easily explain the full extent of extreme global temperatures over the past few months.
A number of different potential contributors to recent global temperature records have been identified, including an uptick in the 11-year solar cycle, an unusual volcanic eruption last year that put a large amount of water vapour into the stratosphere with minimal cooling sulphate aerosols, and a 2020 phaseout of planet-cooling sulphur dioxide in marine shipping fuels.

The figure below, developed by Dr Robert Rohde at Berkeley Earth, shows a current best-estimate of the impact of each of these effects over the past 10 years based on published studies to-date. The shading indicates a warming (red) or cooling (blue) influence on global temperatures.

While each of these factors are small on their own, their combined effects may be to add around 0.1C to global temperatures in 2023.

Estimated drivers of global surface temperature evolution over the past decade.
Estimated drivers of global surface temperature evolution over the past decade. Note that marine fuel pollution reduction should technically be part of human-caused global warming (which includes both greenhouse gas and aerosol emissions), but is separated out for clarity. Credit: Berkeley Earth

Temperatures are tracking climate model projections

Climate models provide physics-based estimates of future warming given different assumptions about future emissions, greenhouse gas concentrations and other climate-influencing factors.

The figure below shows the range of individual models forecasts featured in the Intergovernmental Panel on Climate Change’s (IPCC) fifth assessment report – known collectively as the CMIP5 models – between 1970 and 2030, with grey shading and the average projection across all the models shown in black. Individual observational temperature records are represented by coloured lines.

In these models, estimates of temperatures prior to 2005 are a “hindcast” using known past climate influences, while temperatures projected after 2005 are a “forecast” based on an estimate of how things might change.

Twelve-month average global average surface temperatures from CMIP5 models and observations between 1970 and 2023. Models use RCP4.5 forcings after 2005. They include sea surface temperatures over oceans and surface air temperatures over land to match what is measured by observations. Anomalies plotted with respect to a 1981-2010 baseline. Chart by Carbon Brief.

Twelve-month average global average surface temperatures from CMIP5 models and observations between 1970 and 2023. Models use RCP4.5 forcings after 2005. They include sea surface temperatures over oceans and surface air temperatures over land to match what is measured by observations. Anomalies plotted with respect to a 1981-2010 baseline. Chart by Carbon Brief.

While global temperatures were running below the pace of warming projected by climate models between 2005 and 2014, the past decade has been closer to the model average.

Currently the latter part of 2022 and early 2023 is suppressing the 12-month average compared to the most recent months, but observations are expected to be well above the model average by mid-2024.

Record high ocean heat content

Human-emitted greenhouse gases trap extra heat in the atmosphere. While some of this warms the Earth’s surface, the vast majority – around 93% – goes into the oceans. About two-thirds of this accumulates in the top 700 metres, but some also ends up in the deep oceans.

The figure below shows annual OHC estimates between 1950 and present for both the upper 700 metres (light blue shading) and 700-2000 metre (dark blue) depths of the ocean.

Monthly global ocean heat content (in zettajoules – billion trillion joules, or 10^21 joules) for the 0-700 metre and 700-2000 metre layers. Data from IAP. Chart by Carbon Brief.

Monthly global ocean heat content (in zettajoules – billion trillion joules, or 10^21 joules) for the 0-700 metre and 700-2000 metre layers. Data from IAP. Chart by Carbon Brief.

In many ways, OHC represents a much better measure of climate change than global average surface temperatures. It is where most of the extra heat ends up and is much less variable on a year-to-year basis than surface temperatures.

Just about every year since 1991 has set a new OHC record, showing that heat has continued to accumulate in the Earth system as concentrations of atmospheric greenhouse gases have increased.

Over the last 12 months, ocean heat content has increased by 42 zettajoules, or around 72 times as much as the total energy produced by all human activities on Earth last year.

Record low Antarctic sea ice extent

Highly accurate observations of Arctic and Antarctic sea ice have been available since polar-observing satellites became available in the late 1970s.

The figure below shows both Arctic (red) and Antarctic (blue) sea ice extent in 2023, the historical range in the record between 1979 and 2010 (shaded areas) and the record lows (dotted black line).

Arctic and Antarctic daily sea ice extent from the US National Snow and Ice Data Center. The bold lines show daily 2023 values, the shaded area indicates the two standard deviation range in historical values between 1979 and 2010. The dotted black lines show the record lows for each pole. Chart by Carbon Brief.

Arctic and Antarctic daily sea ice extent from the US National Snow and Ice Data Center. The bold lines show daily 2023 values, the shaded area indicates the two standard deviation range in historical values between 1979 and 2010. The dotted black lines show the record lows for each pole. Chart by Carbon Brief.

Arctic sea ice extent during the first three quarters of 2023 has been at the low end of the historical 1979-2010 range, but has not seen any record daily lows except for a few days in February and April.

The annual minimum sea ice extent in September was the sixth lowest on record, though still well above the record low set in 2012.

Weekly Arctic sea ice extent from the US National Snow and Ice Data Center. Chart by Carbon Brief.

Weekly Arctic sea ice extent from the US National Snow and Ice Data Center. Chart by Carbon Brief.

Antarctic sea ice, on the other hand, has set new all-time low records for most of 2023, set a new all-time low extent in February 2023, and has been far below any prior levels ever since mid May.

Weekly Antarctic sea ice extent from the US National Snow and Ice Data Center. Chart by Carbon Brief.

Weekly Antarctic sea ice extent from the US National Snow and Ice Data Center. Chart by Carbon Brief.

The post State of the climate: Global temperatures throughout mid-2023 shatter records appeared first on Carbon Brief.

State of the climate: Global temperatures throughout mid-2023 shatter records

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Analysis: China’s new carbon metric leaves Germany-sized gap in its emissions

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A major change in the way that China measures its core climate goal has effectively halved the growth in the country’s carbon dioxide (CO2) emissions over the past five years.

The revised measure of “carbon intensity”, the amount of CO2 per unit of economic output, implies that China’s emissions have only gone up by 7% from 2020-2025.

This is just half of the 14% rise indicated by previous official statistics.

On paper, the revision creates a gap of 700m tonnes of CO2 (MtCO2) per year, equivalent to the total emissions of Germany or South Korea.

While China has never officially defined how it measures carbon intensity, it has now made what appears to be a retrospective change, with the effect of making targets easier to meet.

The shift means that China officially came close to meeting its carbon-intensity target for 2020-2025, whereas official statistics had previously pointed towards falling well short.

The new definition of carbon intensity has not been made public, but plausible approaches to calculating the metric do not seem to be sufficient to explain the Germany-sized gap.

The apparent gaps or inconsistencies in China’s new carbon accounting also mean that China could meet its international climate pledges for 2030, even if its emissions go up, whereas the previous measure would have required them to fall.

This article explains how the metric appears to have shifted, what changes might potentially explain the revision and what the revised measure implies for China’s climate goals.

Measuring carbon intensity

Reducing carbon intensity – CO2 emissions per unit of GDP – has been China’s key climate commitment since the Copenhagen climate conference in 2009.

At that time, the country pledged to cut its carbon intensity to 48% below 2005 levels by 2020. This was followed up by a 2030 target of a 60-65% reduction, announced in 2014, which was then upgraded to more than 65% in 2021.

Since carbon intensity was made a key progress indicator in China’s 14th five-year plan for 2021-25, the country has reported reductions in carbon intensity every year in its statistical communique, issued at the end of February.

Neither China’s international climate pledges (its nationally determined contributions, NDCs) nor other official documents have ever set out a definition of carbon intensity, despite it being a cornerstone of the country’s climate commitments.

However, until this year, it was possible to closely reproduce the reported numbers, based on a straightforward interpretation of what carbon intensity means.

But the types of emissions that are included in the carbon-intensity metric have now changed.

Previously, it was possible to reproduce the reported carbon-intensity data by combining official GDP data with estimates of emissions from the use of fossil fuels. The latter could be estimated based on the officially reported consumption of coal, oil and gas, multiplied by China’s official emissions factors for the CO2 per unit of energy from each fuel.

The previous carbon-intensity measure apparently included emissions from the use of fossil fuels to generate energy, as well as their use as chemical feedstocks, so-called “non-energy uses”. However, it did not include non-fossil fuel CO2 emissions from industrial processes, such as the production of cement, as shown by the “old scope” in the figure below left.

Chart showing that China has changed the scope of its carbon-intensity metric
Old and new scopes of China’s CO2 emission reporting from fossil-fuel use and industrial processes. Source: Analysis for Carbon Brief by Lauri Myllyvirta. See “about the data” for further details.

Based on the annually reported progress against this old scope, China’s carbon intensity had fallen by a total of 12.4% from 2020-2025.

This was well short of the 18% target set for these years under the 14th five-year plan.

In September 2025, Huang Runqiu, head of the Ministry of Ecology and Environment, acknowledged this gap, saying that meeting China’s carbon-intensity targets had become “more challenging” due to the effects of the Covid-19 pandemic and trade tensions.

Yet the 15th five-year plan, published in March 2026, reported that China had cut its carbon intensity by 17.7% over the same period – just shy of the 18% target.

As such, it is clear that there has been a major shift in the way that China measures its carbon intensity, specifically in terms of which types of emissions are included.

Moreover, the revised numbers imply that – rather than missing it by a large margin – China officially came close to meeting its carbon-intensity target for the 14th five-year plan.

A footnote in China’s latest statistical communique offers a brief description of carbon intensity as relating to the CO2 emissions from “energy activities and industrial production”.

This indicates that the carbon-intensity calculation now includes industrial process emissions and excludes non-energy uses of fossil fuels, shown by the “new scope” in the figure above.

In comments sought by Carbon Brief, Ryna Cui, associate research professor at the University of Maryland School of Public Policy, who was not involved in the analysis, agrees that the changes to the carbon-intensity methodology are “unclear”. However, she notes that “limited data” makes it challenging to fully verify the nature and impact of the changes.

The revision mirrors a recent change made to the way that China measures its “energy intensity”, the energy use per unit of economic output. In 2024, energy intensity was changed to exclude non-energy use of fossil fuels and energy use from non-fossil fuels.

This exclusion also created a major incentive for expanding the chemical industry and the non-energy use of fossil fuels.

As for the change in carbon-intensity metric, this follows the highly energy-intensive pattern of economic growth during and after the Covid-19 pandemic and China’s “zero-Covid” policy.

Germany-sized gap

The shift in the way that China is measuring its carbon intensity has implications for estimates of the country’s emissions, which are only reported officially some years later.

Changes in carbon intensity and GDP are reported far more quickly – and can be used to estimate changes in China’s CO2 emissions.

China’s total emissions from energy and industrial processes were 11.2bn tonnes of CO2 (GtCO2) in 2020. Based on the originally reported changes in carbon intensity and GDP, its fossil-fuel CO2 emissions had grown 14% by 2024, an increase of 1,430m tonnes (MtCO2).

In contrast, the newly reported carbon-intensity figures imply that China’s CO2 emissions only grew by 7% between 2020 and 2025, up just 690MtCO2, as shown by the figure below.

The gap between these figures amounts to 730m tonnes of CO2 (MtCO2), equivalent to the annual emissions of Germany or South Korea.

Chart showing that China's new carbon metric leaves Germany-sized gap in emissions
Estimated annual changes in China’s CO2 emissions, relative to 2020=100. Blue line: Estimate based on originally reported changes in carbon intensity. Red: Based on changes reported in 2026. Source: Analysis for Carbon Brief by Lauri Myllyvirta. See “about the data” for further details.

On paper, therefore, the change in the carbon-intensity metric effectively halves the rate of growth in China’s CO2 emissions over the past five years.

Decoding the new carbon-intensity methodology

The change in the carbon-intensity metric could have other significant implications, explored below, making it important to understand how it is being calculated.

Yet, while there are some indications of what the new approach entails, these changes do not seem to account for the magnitude of the revision.

The new scope includes industrial-process emissions. One of the largest sources of these emissions, the cement industry, has been contracting due to a slowdown in real estate and infrastructure construction.

This reduction in emissions is one reason why China’s carbon intensity has improved more quickly under the new scope than under the old one.

In addition, the new scope excludes non-energy use of fossil fuels – largely relating to the chemicals industry – where there has been rapid growth over the past five years.

This is another factor in carbon intensity improving faster under the new scope.

Indeed, China’s chemicals industry drove more than half of the growth in its total fossil-fuel use in the past five years, including 40% of coal use and all of oil use. As a result, non-energy use reached 13% of the total consumption of fossil fuels in 2025, up from 7% in 2020, after growing at an average annual rate of 13%.

The figure below illustrates the impact of these changes in scope. It shows the change in China’s emissions from 2020-2025 due to the use of fossil fuels for energy, its industrial-process emissions and non-energy use of fossil fuels.

The first few rows show changes based on the consumption of fossil fuels overall, amounting to a combined 1,430MtCO2 rise in emissions.

This compares with the 690MtCO2 rise implied by the new carbon-intensity metric, leaving that Germany-sized 730MtcO2 gap in emissions. The new scope explains some of this gap.

In terms of industrial processes, the 30% fall in cement production could account for a 300MtCO2 fall in China’s CO2 emissions. In addition, the amount of carbon stored in products, such as plastics, asphalt and rubber, could account for an estimated 100MtCO2 fall in emissions.

On the other hand, emissions from the incineration of plastics increased by an estimated 40% and from metals industry processes by 10%, with aluminium production having expanded by 21%. Together, these would have increased emissions by an estimated 60MtCO2.

In total, the changes in emissions from fossil-fuel use, industrial processes, carbon retained in products and waste incineration add up to a combined 1,070MtCO2 rise from 2020-2025, shown in the penultimate row of the figure below.

Again, this revised total – based on the change in scope of the carbon-intensity metric – goes some way to explaining the Germany-sized gap in China’s CO2 emissions.

However, the new carbon-intensity figures imply that China’s CO2 emissions only increased by 690MtCO2, as shown in the final row of the figure below. This leaves a residual gap of around 380MtCO2, which does not appear to be accounted for by the data available.

Chart decoding China's new carbon-intensity metric
Changes in China’s emissions by source from 2020-2025, MtCO2. Source: Analysis for Carbon Brief by Lauri Myllyvirta. See “about the data” for further details.

One way to make the numbers add up would be to assume that the amount of carbon embedded in chemical-industry products has increased by the equivalent of 500MtCO2.

However, the reported output of major chemical-industry products cannot account for this level of embedded carbon. The figure below shows that the increase in output of major chemical products only explains around a 110MtCO2 increase in retained carbon.

Much of the increase in the production of plastics was cancelled out by a contraction in the use of bitumen for asphalt, due to lower road-building activity.

Chart showing that a growing number of carbon is being stored in manufactured products
The amount of carbon retained in products from 2005-2025, MtCO2. Source: Analysis for Carbon Brief by Lauri Myllyvirta. See “about the data” for further details.

Furthermore, the 14th five-year plan for 2021-25 had a target of raising the share of waste incineration to 65% of urban residential waste treatment capacity, up from 45% in 2020.

So, while plastics production did go up, resulting in increased amounts of retained carbon, a larger share of this retained carbon was being incinerated, meaning its carbon would quickly be released back into the atmosphere.

One reason why carbon retained in products has grown more slowly than the amount of fossil fuels used in chemicals production is that the fastest growth has been in the coal-based chemicals industry.

Coal-based processes have a much lower conversion efficiency than oil- and gas-based production, with process emissions that are typically multiple times as high.

For example, these emissions are 10 times as high for the production of olefins – a key plastics feedstock – from coal as compared with oil or gas. The process is reported to require 3.75 tonnes of standard coal per tonne of product. This implies that only 30% of the carbon in the coal is retained in the product, with the other 70% being emitted in the process.

There are also chemical processes that use fossil fuels as a feedstock, but where the end product does not contain carbon. One example is ammonia, a key building block for fertiliser, where production grew by 52% from 2020 to 2025.

Neither the change in scope of the carbon-intensity calculation, nor the change in the amount of carbon retained in products, is sufficient to explain the size of the revision in the newly reported numbers. There must be another explanation.

There are two options. Either the new scope broadly aligns with what is outlined above, but also excludes a subset of the CO2 emissions. Or the scope does not exclude any of the CO2, but there are gaps in the monitoring of some energy or industrial-process emissions.

Either explanation would mean that China is not accounting for some of its CO2 emissions. It would also mean that the improvement in carbon intensity for 2020-2025 is over-reported.

China’s latest officially reported emissions inventories reinforce the second of the two options above, namely, that there are gaps in emissions reporting from the chemical industry.

From 2018 to 2021, the latest year for which China has reported on its emissions, the CO2 output of chemical-industry processes only increased by 13%. Over the same period, non-energy use of fossil fuels increased by 29%, according to data reported to the International Energy Agency by the Chinese government.

One factor in these apparent gaps could be that China’s National Bureau of Statistics (NBS) is required to publish data on carbon intensity very quickly, since it is a key indicator in the country’s five-year plans.

On the other hand, detailed greenhouse gas emissions inventories and energy statistics are only published years later, by the environment ministry and NBS, respectively.

What the change means for China’s targets

The change in the definition of carbon intensity has the effect of weakening China’s climate targets and introducing more uncertainty into tracking progress.

On the basis of China’s new numbers, it will require less effort to hit the 2030 target for a 65% reduction in carbon intensity on 2005 levels, as per China’s Paris pledge.

This target can now be met even if CO2 emissions go up between 2025 and 2030, whereas the previous metric would have required a reduction.

It will also require less effort to hit the 17% target in the 15th five-year plan.

The apparent gaps in the CO2 emissions numbers for 2025 could affect the delivery of China’s other key climate pledges, such as the commitment to peak CO2 emissions before 2030. They could also allow the chemical industry’s CO2 emissions to continue climbing rapidly, while still officially meeting the 2030 goals for CO2 intensity.

Moreover, the apparent gaps or inconsistencies in China’s new carbon accounting also mean that China would be able to officially meet its target to peak its CO2 emissions by 2030, even if its overall CO2 emissions do not actually reach a peak.

The apparent gaps could also affect the delivery of China’s newer target to cut its greenhouse gas emissions to 7-10% below peak levels by 2035 and beyond.

Nevertheless, researchers and analysts can still monitor progress by calculating China’s CO2 emissions independently.

China’s reporting on fossil-fuel consumption, the output of plastics and other carbon-containing products, as well as manufacturing of commodities with substantial process emissions, provides a basis for tracking emissions under the new scope.

While under the UN’s climate framework China is free to use any definition it wants to meet its own nationally determined climate pledges, retrospective changes to methodology or inconsistent accounting could erode the value of the country’s commitments.

Moreover, it will, ultimately, have to close any gaps in its emissions data and reporting, under the transparency rules of the Paris Agreement.

China’s next transparency report to the UN, due by the end of this year, should also provide more clarity on the methodology and data underlying the revised numbers.

This underscores the importance of monitoring, reporting and verification for industrial process emissions. “Mass balances” based on fossil-fuel consumption and product output could be used as a check on CO2 emissions reporting. Finally, China’s emissions data could also be made more granular and clearly defined.

Carbon Brief has approached the National Bureau of Statistics and Ministry of Ecology and Environment for comment.

The University of Maryland’s Cui tells Carbon Brief that in general, China’s climate goals are “improv[ing]” in terms of their coverage and scope. However, she adds:

“The issue is…the ambiguity and inconsistency in the coverage, definition and method between target setting and progress tracking, which can lead to large uncertainties and room for manipulation. It highlights the importance of transparency in national climate targets, following the UNFCCC’s international transparency framework, which should also be applied as best practices for domestic targets.”

About the data

The calculations in this analysis are based on China’s total coal, oil and gas consumption from energy statistical yearbooks covering the years until 2023, with data for 2024 and 2025 taken from the latest statistical communiques.

“Originally reported” CO2 emissions were back-calculated from carbon-intensity reductions and GDP growth given in annual statistical communiques. The revised emissions for 2020, 2024 and 2025 are similarly back-calculated from the reductions in carbon intensity from 2020 to 2025 and from 2024 to 2025, as reported in the 15th five-year plan outline and the 2025 statistical communique, respectively, combined with annually reported GDP growth.

Cement process emissions up to 2024 are from Robbie Andrews’ estimates, scaled to 2025 based on year-on-year change in total cement output.

Process emissions from the metals industry are based on calculating emissions for aluminium, silicon, lead, zinc and crude steel from the bottom-up, using industrial output data and IPCC default emission factors scaled to the reported total in 2021. For steel, the calculations are based on typical quicklime use in basic-oxygen and electric-arc furnaces.

Emissions from the incineration of plastics are based on a peer-reviewed estimate of plastics incineration in 2022, combined with growth rates in the overall power generation from waste-to-energy plants. The analysis assumes that the share of plastics in the energy content of the incinerated waste stayed constant over this period, which is a conservative assumption given the rapid rise in plastics production.

Total non-energy use of fossil fuels in 2020, 2024 and 2025 is available from an NEA data release, with data for 2021-2023 found in the China energy statistical yearbook 2025.

The mix of coal, oil and gas within non-energy use is based on the energy statistical yearbook data up to 2023, with the increase in coal in 2024 and 2025 based on Wind Financial Terminal data on coal consumption in the chemical industry. Gas use, which is relatively minor, is assumed to have grown on trend and oil is calculated as the residual.

Primary plastics, rubber, and urea output data are from NBS industrial statistics. The production of solvents, lubricants and waxes, as well as the use of bitumen in construction, is from energy statistical yearbooks. The analysis assumes no change in output from 2023 to 2025, given the lack of clear trends.

The post Analysis: China’s new carbon metric leaves Germany-sized gap in its emissions appeared first on Carbon Brief.

Analysis: China’s new carbon metric leaves Germany-sized gap in its emissions

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Climate Change

Revealed: Floods have forced at least 67 closures at NHS hospitals since 2021

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At least 67 NHS hospital wards, departments and other sites across the UK have been forced to temporarily close or relocate due to weather-related flooding over the past five years, a Carbon Brief investigation reveals.

Maternity centres, surgical theatres, a neonatal intensive-care unit and even entire hospital buildings have been disrupted by heavy rainfall or encroaching floodwaters.

Carbon Brief submitted freedom-of-information (FOI) requests to 162 NHS trusts, which show that while many flood-related shutdowns were brief, some lasted for weeks or months.

In total, 148 trusts responded to these requests with reports of 67 flood-related shutdowns, giving detailed data for 30 incidents that resulted in a total of 3,000 days of closures.

Reports of flooding at NHS sites have been on the rise, according to NHS England data.

This comes as the UK experiences wetter winters, with periods of extreme rainfall that are increasingly linked to human-caused climate change.

These floods can exacerbate existing problems in a healthcare system that is already struggling with insufficient funding, old hospital buildings and a backlog of maintenance work.

Indeed, while there have been efforts to make UK hospitals more resilient to extreme weather, one expert tells Carbon Brief that such measures are difficult to implement when these institutions are struggling to keep their “heads above water”.

Rising floods

Floods pose a threat to people’s health, but they also threaten the UK’s healthcare infrastructure. Water can enter hospitals, paralyse ambulance services and damage equipment, placing strain on an already stretched NHS.

NHS records show that the number of flood incidents “caused by external weather events” in facilities across England has doubled since 2021, reaching nearly 400 in 2024-25.

Equivalent data is not available for Scotland, Wales and Northern Ireland, although there have been reports of floods disrupting services across the whole UK.

As global temperatures rise and the atmosphere holds more moisture, UK winters are getting wetter. Attribution studies show climate change has increased the severity of recent rainfall and flooding events – including Storm Eunice in 2022 and Storm Babet in 2023.

There is also a risk of increased flooding when heavy rain hits after periods of intense drought, of the kind seen in recent years.

Environment Agency modelling suggests that a rising share of medical facilities in England will be at risk of flooding due to climate change. It says the share of sites at risk will increase from a quarter in 2024 to a third by the middle of the century.

Despite this apparent threat facing the UK’s healthcare system, there is limited information about the extent to which these floods are already disrupting NHS services.

Closed services

To build a fuller picture of NHS-wide flooding, Carbon Brief sent FOI requests to 162 trusts and health boards – the organisations in charge of health services – across England, Scotland, Wales and Northern Ireland.

They were asked for details of wards, departments or services that had been temporarily or permanently closed due to weather-related flooding, such as river floods or heavy rainfall, between 2021-22 and the start of 2026.

In total, 148 of these bodies responded with details of 67 incidents in which weather-related floods have triggered closures. The map below shows where these incidents were located, from hospital wards in Scotland to an eye unit on the south coast of England.

Map of the UK showing that at least 67 NHS sites have been forced to close due to weather-related flooding since 2021
Sites of weather-related flooding incidents at NHS facilities. The size of the circles indicates the number of incidents reported at each site. Source: NHS trust FOI responses to Carbon Brief.

The 67 flooding-related disruptions reported by NHS trusts and health boards is likely an underestimate. Many trusts told Carbon Brief they did not record such detailed information or that collating it would be too time-consuming.

Nevertheless, the results provide an insight into the kind of risks facing NHS services as weather gets more extreme.

Among the closures were 13 accident and emergency (A&E) departments, urgent treatment centres and minor injuries units. There were also 10 hospital wards, 10 surgical theatres, five maternity units and a neonatal intensive-care unit affected by flooding.

Many trusts did not provide information about how long each closure lasted. However, the 30 incidents where timespans were provided add up to the equivalent of more than 3,000 days – or eight years – of closures across NHS sites.

The infographic below provides a snapshot of some notable closures from the dataset.

Notable incidents of weather-related flooding at NHS facilities. Source: FOI responses to Carbon Brief.
Infographic showing case studies of wards and departments closed by flooding at NHS sites
Notable incidents of weather-related flooding at NHS facilities. Source: FOI responses to Carbon Brief.

The entire Buckland Hospital site in Dover closed for two days in 2025 amid “exceptional rainfall” and flash floods. People seeking radiology, maternity and urgent-care services were told not to visit over the weekend and various clinical services were delayed or cancelled.

The NHS declared a “major incident” in 2021 when flood waters “caused power outages impacting multiple areas” at Whipps Cross Hospital in north-east London – including its maternity service – for four days. Neighbouring hospitals also flooded.

Some closures lasted far longer. In Stroud General Hospital, a surgical theatre was closed for two weeks and an X-ray facility for around two months after storm water overflowed into the building in 2023.

Several NHS trusts stressed that the flooding incidents they reported were localised – often resulting from roof leaks exacerbated by heavy rain – and resulted in minimal disruption. Sometimes, as with a cardiology suite in Cannock Chase Hospital, the service was moved and the trust says patient care was not disrupted.

However, the responses also showed the breadth of damage such events can cause, including rainwater “pouring onto expensive equipment” and floods triggering the long-term relocation of services.

For example, Orchard Cottage, a site that provided care for adults with learning disabilities in Derbyshire, experienced major flooding during Storm Babet in 2023 and was permanently shut down as a result.

Adaptation needs

The UK Health Alliance on Climate Change, a group of UK health organisations, concluded in a report in 2025 that, with flood risks projected to grow, there is an “urgent need for adaptation measures” across the nation’s healthcare facilities.

Government advisors at the Climate Change Committee have highlighted the need for flood resilience in UK hospitals, including flood barriers, waterproofed electricals and built-in redundancy for critical areas, such as theatres, labs and IT equipment.

There have been various measures at both government and NHS level intended to improve the resilience of medical facilities to climate-related hazards.

The UK’s national adaptation programme sets out expectations for NHS England to “adapt NHS infrastructure to extreme weather events”. All trusts must have “green plans” in place, which require climate change to be factored into infrastructure decisions, for example, through the creation of drainage systems or green spaces.

Yet, as it stands, three-quarters of UK doctors say their workplaces are not prepared for the impact of extreme weather and nearly half of healthcare workers report that extreme weather has disrupted NHS services in the past five years.

Many hospitals have outdated infrastructure – often predating the founding of the NHS – which was not designed to cope with climate change. Prof Hugh Montgomery, chair of intensive-care medicine at University College London, tells Carbon Brief:

“The hospitals themselves weren’t built for this weather any more than anything else is really – and of course it’s going to get worse, in an exponential function.”

Many of the FOI responses provided to Carbon Brief identified specific building defects, such as roof leaks, which led to the flooding incidents during periods of heavy rainfall. There is a huge – and growing – backlog of maintenance work at NHS hospitals that was estimated in 2024-25 to need repairs costing £15.9bn.

Chris Naylor, a senior fellow at the King’s Fund, a thinktank focusing on health policy, tells Carbon Brief:

“Dealing with some of the backlog maintenance would probably help with climate adaptation as well, because of leaky roofs and all the rest of it. But we do also need to be thinking specifically about climate adaptation within the NHS and making sure there is funding for that.”

Montgomery points out that with trusts “mostly bankrupt” and most hospitals running a deficit, the question remains how to fund such interventions. “They’re struggling to keep their heads above water and they’re losing money,” he says.

Dr Mark Harber, a consultant nephrologist and special adviser on climate change at the Royal College of Physicians, tells Carbon Brief that hospitals at least need to make plans for extreme weather. This is particularly important for patients in need of time-dependent and life-saving treatments, such as kidney dialysis and chemotherapy.

Harber notes that hospitals, supply chains and transport could all be disrupted by floods:

“You have to have plans in place to deal with that, even if the NHS can’t deal with the flooding risk per se.”

Carbon Brief asked NHS England – which is responsible for the majority of the trusts that reported flooding disruption – for comment, but had not received a response at the time of publication.

Methodology

The list of incidents reported by trusts can be viewed here.

Carbon Brief sent FOI requests to 120 English NHS trusts that have reported any incidents of flooding since 2021 in NHS England’s Estates Returns Information Collection (ERIC) dataset. This covers around 60% of all English NHS trusts.

Carbon Brief also filed FOI requests with all 42 of the health boards and trusts in Scotland, Wales and Northern Ireland, which are equivalent to English NHS trusts.

All trusts and health boards were asked for details of wards, departments or services that have been temporarily or permanently closed due to weather-related flooding, such as river flooding or heavy rainfall.

This matches the wording used to describe a flooding event in the ERIC system, which requires the reporting of all flood events “caused by external weather events” that trigger a risk assessment by staff. Such external events are distinct from floods caused by other issues that are not related to the weather, such as burst pipes.

In total, 14 trusts did not respond and many more said they did not hold the data requested. Some trusts provided data, but on further questioning stated that the data they provided covered all flooding events and it was not possible to say which were related to weather conditions. These cases have not been included in the final dataset.

The post Revealed: Floods have forced at least 67 closures at NHS hospitals since 2021 appeared first on Carbon Brief.

Revealed: Floods have forced at least 67 closures at NHS hospitals since 2021

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Climate Change

Nature cannot be ignored by Europe’s next big budget

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Adeline Rochet is a programme manager for the Corporate Leaders Group Europe, a business coalition driving the transition to a sustainable, competitive, and resilient economy convened by the University of Cambridge Institute for Sustainability Leadership (CISL).

Europe’s economy depends on the natural world functioning as it should, but the effects of climate change risk undermining increasingly delicate ecosystems. Talks about the European Union’s next long-term budget miss this fact.

Climate-related losses in the EU have already reached €822 billion since 1980, with a quarter of that damage concentrated in just the past four years. Ecosystems are under increasing pressure: more than 80% of protected habitats are in poor condition, soils are degrading and water stress is rising across the continent.

The latest state of the climate report by the EU’s Earth monitoring service Copernicus confirms this worrying state of affairs: 95% of Europe experienced above-average temperatures in 2025.

Economic exposure to nature-related risk is also growing. Businesses, banks and insurers are beginning to reflect this in their risk assessments.

So, will the policymakers in charge of developing the European Union’s next big budget integrate this vision? We are in the midst of finding out.

    Every seven years, the EU must negotiate a new budget that will help fund priorities over a seven-year-long period. The current one, which runs out next year, is worth more than a trillion euros.

    Talks about the next multiannual financial framework (MFF) for 2028-2034 are now getting serious and the initial outline of this new budget shows it will focus on competitiveness, resilience and prosperity.

    But, as the European Parliament adopted its negotiating position for the crunch budget talks and EU member states shape their approach ahead of a Council meeting on May 26, it is clear that the positioning of nature within this framework is strategically underestimated.

    Why nature impacts economic growth 

    Back in 2022, France’s nuclear power output was severely affected when heatwaves drove up the temperature of the rivers used to cool atomic reactors, impacting other European countries too. This was particularly poor timing given the energy price crisis triggered earlier that year by Russia’s illegal invasion of Ukraine.

    Low river levels caused by drought have also heavily impacted economic activity and growth in countries like Germany, due to the negative effect on inland trade, while degraded fields in the Netherlands combined with heavy rainfall have ruined potato harvests.

    These examples show that we cannot detach the health of the European economy from the good functioning of nature.

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    Nearly three-quarters of businesses in the eurozone rely directly on ecosystem services such as clean water, fertile soils and pollination. That dependency extends into the financial system, where around 75% of bank lending is exposed to companies dependent on these natural assets.

    They entirely underpin supply chains and financial stability across the European economy. If load-bearing ecosystems collapse, businesses not only face disruption in their own operations, but they will also be exposed to failures from suppliers and customers.

    This is not just a risk for individual companies, it is a threat for the whole system.

    A budget that looks greener than it is

    According to the latest proposals for the next MFF, a single 35% climate and environmental target will replace priorities that used to have distinct funding. As it stands, biodiversity has a 10% target, yet spending has struggled to reach even 8%, already showing how easily it is put to one side in practice.

    In the new framework, biodiversity is absorbed into a broader category with no separate tracking or visibility. Dedicated instruments are folded into larger funding envelopes, and nature-based investments are placed in direct and distorted competition with industrial projects.

    These are often faster to deploy and easier to measure, making them more attractive.

    Headline figures reinforce some appearance of ambition, with €587–635 billion allocated to climate and environmental objectives. But since these are aggregated numbers, they do not show how much will reach ecosystem conservation or restoration.

    Less visibility, weaker accountability

    Biodiversity funding also remains structurally fragile, with around 80% concentrated in agriculture policy rather than supported by a diversified investment strategy.

    This shift is structural: nature has been relegated from a defined priority to a mere discretionary allocation, and the governance model reinforces this dynamic.

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    Greater reliance on National and Regional Partnership Plans (NRPPs) moves decision-making into national spending choices, where fiscal and domestic political pressure will likely mean long-term ecosystem investments struggle to compete with short-term economic demands.

    The current MFF paints a worrying picture of structural triple risk for nature: reduced visibility, increased competition for funding and weaker accountability.

    Nature is critical infrastructure

    It is a point worth reiterating: investment in nature offers clear economic returns. Healthy ecosystems drive resilience by reducing exposure to climate damage and supporting local economic activity.

    Public finance plays a decisive role in enabling these investments at scale, making budget design a question of risk management and capital allocation.

    Nature-based solutions already perform essential economic functions. They regulate water systems, restore carbon sinks, provide a buffer against extreme weather events and support agricultural productivity.

    These are characteristics of infrastructure. Energy systems, transport networks and digital capacity are treated as strategic investments because they underpin competitiveness.

    Natural systems play the exact same role, so why does the current budget plan not reflect this?

    The next EU budget will shape investment for the decade ahead. Its structure will determine how risks are managed and where capital flows. Nature cannot be erased in favour of competing short-term priorities.

    In the upcoming negotiations, European leaders still have the option to treat nature as a structural objective and a core asset, supporting Europe’s resilience and long-term competitiveness. But they must act now, before it’s too late.

    The post Nature cannot be ignored by Europe’s next big budget appeared first on Climate Home News.

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